重写保存按钮save事件

 _saveActionEventHandler:function(event,value){
             if (!_self.fireEvent("saveBefore")) return;
             var option = _self.getOptionFromArguments(arguments);
             _self.fireEvent("fieldOnStoreEvent");
                         //更改保存的数据
              _self._model.number = 123;
                         var editModel = waf.toJSONString(_self.getCurrentModel());
             option.action = "save";
             if (option&&option.data){
                 option.data.model=editModel;
             }
             else{
                 option.data = {
                     model:editModel
                 }
             }
             option.success = option&&option.success?option.success:function(objectPK){
                 _self.showInfo(waf.dynamicEdit.info.savesuccess);
                 document.location.href = listUrl;
             }
             waf.doPost(option);
         }
     });
     //注册数据保存事件
     _self.subscribeEvent("saveActionEvent", _private._saveActionEventHandler,"overwrite");​